秦祁昆接合部二叠纪沉积建造时空分布  

The Distribution of Permian Sedimentary Sequences in the Adjacent Area of Qinling-Qilian-Kunlun

作　　者：寇晓虎[1] 张克信[1] 林启祥[2] 朱云海[1] 陈奋宁[1] 罗根明[1] 徐亚东[1] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室和教育部生物与环境地质重点实验室,湖北武汉430074 [2]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2007年第5期681-690,共10页Earth Science-Journal of China University of Geosciences

基　　金：高等学校全国优秀博士学位论文作者专项资金项目(No200228);中国地质调查局1:25万区域地质调查项目(Nos200413000007;1212010610316)

摘　　要：研究区位于秦祁昆结合部及邻区.二叠纪时,研究区以南祁连构造地层带为界,呈现北陆南海对峙格局:北部的中祁连、北祁连和阿拉善主要为一套砾岩、砂岩和泥岩为主的河湖相沉积;南祁连为海陆交互相碎屑岩、灰岩沉积;南部西秦岭和东昆仑主要是以半深海-深海浊积岩、玄武岩和海山碳酸岩盐为主的多岛洋沉积.本次1∶25万临夏市幅和定西市幅地质填图中,笔者在西秦岭与南祁连结合部位的甘肃夏河县甘加一带,发现一套早-中二叠世小洋盆玄武岩和碳酸盐岩海山建造,与秦昆结合部布青山-花石峡-兴海一带的早-中二叠世多岛洋沉积建造可以对比.晚二叠世,北部的秦祁结合部仍为半深海-深海浊积岩沉积,而南部秦昆结合部则转换为前陆-磨拉石沉积建造.The study area is located in the copulae of Qinling-Qilian-Kunlun and adjacent area. In Permian, with the borderline of tectonie-stratigraphic belt in South Qilian, the south is marine facies sediment environment and the north is continental facies sediment environment： In the middle Qilian, North Qilian and Alashan of north district, the sediment is conglomerate, sandstone and mudstone, and it belong to fluvial and lacustrine facies sediment environment; In the south Qilian of mid-district, the sediment environment is belong to marine continental alternation facies with elastic rocks and limestone; In the West Qinling and East Kunlun of the south district, the sediment environment is archipelagic ocean including turbidite rocks of bathyal facies and abyssal facies, basalt, seamount carbonate and so on. During the geological mapping of 1 ： 250 000 Linxia city and Dingxi City, we found small ocean basin and carbonate seamount formation of early and middle Permian between West Qinling in Ganjia, Xiahe County, Gansu Province. And this can contrast with the archipelagic ocean sediment formation between Qinling and Kunlun in the area of Buqingshan-Huashixia-Xinghai. In late Permian, the sediment is still turbidite rocks of half-sea and deep-sea between Qinling and Qilian, but it is foreland-molasses sediment formation between Qirding and Kunlun.

关 键 词：秦祁昆 二叠纪 沉积建造 多岛洋 

分 类 号：P542[天文地球—构造地质学]